Ensuring lasting quality in rotary encoders

Paul Boughton

In the construction of rotary encoders bearing performance is critical. Special attention needs to be paid to bearing durability under continuous load.

In order to ensure the highest quality and performance standards, Wachendorff Prozestechnik GmbH in Germany conducts rigorous testing for its rotary encoder designs. The exhaustive series of tests confirm performance in a simulated application environment and the data is recorded to ensure optimum design and quality assurance.

The belt-driven test stands utilise a WDG reference encoder and test four additional encoders at one time. A pneumatic control applies a defined force F to the encoder's bearings. A climatic chamber is used at various humidity and temperature settings along with a shaker to add vibration and shock to each unit. Various motor speeds are held constant by a controller and confirmed with a tachometer. Total revolutions are also counted. Four different test cycles are used to vary load, speed, temperature, humidity and vibration. All the data including output frequencies of the individual encoders as well as pressure of the pneumatics scaled for the force F at each bearing is logged by the DC2000 paperless recorder. Quality Inspectors can observe the each test via the graphic display and store/recall all the test parameters.

The recorder provides 12 universal inputs and all values can be freely scaled and saved in different time cycles. The sampling rate of eight readings per channel means that even rapid changes can be documented. Test data is saved on a Compact Flash card and transferred to a PC so different departments can utilise the data efficiently.

Monarch Instrument is based in Amherst, New Hampshire, USA. www.monarchinstrument.com

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